<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>权限管理</el-breadcrumb-item>
      <el-breadcrumb-item>角色列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 添加角色按钮区域 -->
      <el-row>
        <el-col>
          <el-button type="primary">添加角色</el-button>
        </el-col>
      </el-row>

      <!-- 角色列表区域 -->
      <el-table :data="roleList" border stripe>
        <!-- 展开列 -->
        <el-table-column type="expand">
          <!-- 自定义插槽区域 -->
          <template slot-scope="scope">
            <el-row
              :class="['bdbottom', i1 === 0 ? 'bdtop' : '']"
              v-for="(item1, i1) in scope.row.children"
              :key="item1.id"
            >
              <!-- 渲染一级权限 -->
              <el-col :span="5" align="center">
                <el-tag
                  closable
                  @close="removeRightById(scope.row, item1.id)"
                  >{{ item1.authName }}</el-tag
                >
                <i class="el-icon-caret-right"></i>
              </el-col>
              <!-- 渲染二级和三级权限 -->
              <el-col :span="19">
                <!-- 通过for循环嵌套二级权限 -->
                <el-row
                  :class="[i2 === 0 ? '' : 'bdtop']"
                  v-for="(item2, i2) in item1.children"
                  :key="item2.id"
                >
                  <!-- 二级权限 -->
                  <el-col :span="6" align="center">
                    <el-tag
                      type="success"
                      closable
                      @close="removeRightById(scope.row, item2.id)"
                      >{{ item2.authName }}</el-tag
                    >
                    <i class="el-icon-caret-right"></i>
                  </el-col>
                  <!-- 三级权限 -->
                  <el-col :span="18">
                    <el-tag
                      type="warning"
                      v-for="item3 in item2.children"
                      :key="item3.id"
                      closable
                      @close="removeRightById(scope.row, item3.id)"
                    >
                      {{ item3.authName }}
                    </el-tag>
                  </el-col>
                </el-row>
              </el-col>
            </el-row>
            <!-- <pre>
              {{ scope.row }}
              数据结构
            </pre> -->
          </template>
        </el-table-column>
        <el-table-column type="index" label="#" align="center">
          <!-- 索引列 -->
        </el-table-column>
        <el-table-column
          label="角色名称"
          prop="roleName"
          align="center"
        ></el-table-column>
        <el-table-column
          label="角色描述"
          prop="roleDesc"
          align="center"
        ></el-table-column>
        <el-table-column label="操作" align="center" width="320px">
          <!-- 使用自定义作用域插槽 -->
          <template slot-scope="scope">
            <el-button type="primary" icon="el-icon-edit" size="small" round
              >编辑</el-button
            >
            <el-button type="danger" icon="el-icon-delete" size="small" round
              >删除</el-button
            >
            <el-button
              type="warning"
              icon="el-icon-setting"
              size="small"
              round
              @click="showSetRightDialog(scope.row)"
            >
              分配权限
            </el-button>
          </template>
        </el-table-column>
      </el-table>
    </el-card>

    <!-- 分配角色权限的对话框 -->
    <el-dialog
      title="分配权限"
      :visible.sync="showSetRightDialogVisible"
      width="50%"
      @close="showSetRightDialogClosed"
    >
      <!-- 树形控件 -->
      <el-tree
        :data="rightslist"
        :props="treeProps"
        show-checkbox
        node-key="id"
        default-expand-all
        :default-checked-keys="defKeys"
        ref="treeRef"
      ></el-tree>
      <span slot="footer" class="dialog-footer">
        <el-button @click="showSetRightDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="allotRights">
          确 定
        </el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      // 所有角色的列表数据
      roleList: [],
      // 控制分配权限对话框的显示与隐藏
      showSetRightDialogVisible: false,
      // 所有权限的数据
      rightslist: [],
      // 树形控件的属性绑定对象
      treeProps: {
        label: "authName",
        children: "children",
      },
      defKeys: [
        // 默认选中的节点id值数组
      ],
      // 当前即将分配权限的角色id
      roleId: "",
    };
  },
  //   生命周期函数
  created() {
    this.getRolesList();
  },

  methods: {
    // 获取所有角色的列表
    async getRolesList() {
      const { data: res } = await this.$http.get("roles");
      if (res.meta.status !== 200) {
        returnthis.$message.error("获取角色列表失败");
      }
      console.log(res);
      this.roleList = res.data;
      this.$message.success("获取角色列表成功");
      console.log(this.roleList);
    },
    // 根据id删除对应的权限
    async removeRightById(role, rightId) {
      // 弹框提示用户是否要删除
      const confirmResult = await this.$confirm(
        "此操作将永久删除该文件, 是否继续?",
        "提示",
        {
          confirmButtonText: "确定",
          cancelButtonText: "取消",
          type: "warning",
        }
      ).catch((err) => err);
      if (confirmResult !== "confirm") {
        return this.$message.info("取消删除");
      }
      const { data: res } = await this.$http.delete(
        `roles/${role.id}/rights/${rightId}`
      );
      if (res.meta.status !== 200) return this.$message.error(res.meta.msg);
      this.$message.success(res.meta.msg);
      // 不建议像下面这样直接重新拉区整个列表，这样会导致原本展开的表格合上
      // this.getRolesList();
      role.children = res.data;
    },

    // 展示分配权限的对话框
    async showSetRightDialog(role) {
      this.roleId = role.id;
      // 获取所有权限的数据
      // 解构赋值并且重命名
      const { data: res } = await this.$http.get("rights/tree");
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg);
      }
      // 获取到的权限数据保存到data中
      this.rightslist = res.data;
      this.$message.success(res.meta.msg);
      // 递归获取三级节点的ID
      this.getLeafkeys(role, this.defKeys);
      this.showSetRightDialogVisible = true;
    },
    // 通过递归的形式，获取角色下所有三级权限的id，并保存到defKeys 数组中
    getLeafkeys(node, arr) {
      // 如果当前 node节点不包含node属性，则是三级节点
      if (!node.children) {
        return arr.push(node.id);
      }
      node.children.forEach((item) => this.getLeafkeys(item, arr));
    },
    // 监听分配权限对话框的关闭事件
    showSetRightDialogClosed() {
      this.defKeys = [];
    },
    // 点击为角色分配权限
    async allotRights() {
      const keys = [
        ...this.$refs.treeRef.getCheckedKeys(),
        ...this.$refs.treeRef.getHalfCheckedKeys(),
      ];
      // console.log(keys);
      const idStr = keys.join(",");

      const { data: res } = await this.$http.post(
        `roles/${this.roleId}/rights`,
        { rids: idStr }
      );
      if (res.meta.status !== 200) {
        return this.$message.error(res.meta.msg);
      }
      this.$message.success(res.meta.msg);
      this.getRolesList();
      this.showSetRightDialogVisible = false;
    },
  },
};
</script>

<style scoped>
.el-tag {
  margin: 7px;
}
.bdtop {
  border-top: 1px solid #eee;
}
.bdbottom {
  border-bottom: 1px solid #eee;
}
</style>
